EP4289537A1 - Deburring tool for forward and backward deburring of bore edges - Google Patents

Abstract

Deburring tool for deburring bores with a paired arrangement of cutting knives (2, 2a) and a rotating tool holder (1), the cutting knives (2, 2a) being opposite each other in a knife recess (20) of a knife housing (3) with radially outward-pointing, conical cutting edges (27, 28) are driven to be radially displaceable relative to one another by a rotatable rocker (4) arranged in a base body (6) of the tool holder (1), and the rocker (4) is rotatably mounted in the tool holder (1) about an axial longitudinal axis and is resiliently preloaded in the axial direction, the knife housing (3) being axially displaceable and fixable on the rocker (4) and the base body (6) for changing the blades of the cutting blades (2, 2a).

Description

The invention relates to a deburring tool for the forward and backward deburring of bore edges

The new version of a tool holder described below for deburring or chamfering bore edges with a pair of cutting knives is a further development of deburring tools as described in DE 2649208 A1 [with reference number 1] and DE 102008046087 A1 [with reference number 2]. The description of the deburring tool contained in these two publications is part of the present description of the invention.

The DE 26 49 208 C [1] shows a tool holder for deburring the edges of through holes on both sides with a tool head that can be rotated via a shaft and has two cutting blades that point essentially radially outwards, are guided in receiving slots and are pressed outwards with spring force, the spring force being controlled by means of a Longitudinal axis of the tool holder rotatably arranged rocker can be transferred to the cutting body. The spring is designed as a torsion spring, which is attached to the tool housing on the one hand and, on the other hand, acts on the rocker, which can be rotated in a bore and which engages with peg-shaped extensions in slot-shaped recesses in the cutting blades.

Furthermore, this document shows that the rotational movement of the rocker is limited by an externally actuable adjusting screw whose tip rests on a contact surface of the rocker. The peg-shaped extensions of the rocker are to be brought out of engagement with the cutting blades by means of a screw that engages with an eccentric approach in a recess in the rocker.

The DE 10 2008 046 087 A1 [2] shows a similar deburring tool for deburring bores with a pair of cutting knives and a rotatably driven tool holder, wherein in a rectangular receiving slot (knife recess) the cutting blades are driven opposite one another with radially outward-pointing, conical cutting edges by a rotatable rocker arranged inside the tool holder and can be moved radially against one another by means of rocker bolts arranged on the front side of the rotary rocker.

The rocker is mounted in the tool holder so that it can rotate about an axial longitudinal axis and is resiliently preloaded in the axial direction, with each rocker bolt of the rocker engaging in a respective groove of the cutting knife. The rocker can be raised and lowered in the knife housing of the deburring tool against the force of a torsion spring and the spring preload of the torsion spring can be adjusted in a controlled manner in the torsion direction.

The following additional publications are also known:
The EP 0291563 B1 , describes the design of cutting blades used in the present invention. The DE 2 407 269 A1 describes a different type of guidance and resetting of cutting bodies in a generic deburring tool.

Differentiation from the two publications DE 2649208 A1 [1] and DE 102008046087 A1 [2] on the present invention

The basic principle of the deburring tools described according to the invention remains that of providing two cutting knives arranged in pairs and directed towards one another in a rotating tool holder, which are actuated by a rocker in their radial displacement out of the knife recess of the tool holder or into the knife recess. The rocker is designed as a cylindrical pin and is mounted to rotate about the axial longitudinal axis of the tool holder and is prestressed to rotate by means of a torsion spring. Due to the special shape of the cutting blades, bore edges are deburred both when the deburring tool moves forward into a bore and when the deburring tool moves backwards out of the bore which the opposite hole edge of the same hole is deburred.

However, the technical teaching of the patent claims is not limited to the deburring of bore edges of a through bore on both sides. Only one-sided deburring of a single hole edge can also be provided without deburring the hole edge on the rear side of the through hole. It can also be provided that only the edge of a blind hole is deburred.

The invention is based on the two publications [1] and [2] mentioned above.

1. a) Wird das Exzenterstück nach der Messermontage nicht ordnungsgemäss zurückgestellt greift die Wippe nicht in die Schneidmesser ein und diese können im Zerspanungprozess verloren gehen.
2. b) Die Wippe wird axial gegen die Torsionsfeder (12 [2]) nach hinten bewegt. Infolge der Reibkräfte, vor allem durch im Zerspanungsprozess verursachte Verschmutzung erzeugt, vermag die prioritär für Torsion ausgelegte Feder die Wippe nicht mehr zuverlässig zurückzustellen und diese greift nicht mehr in die Schneidmesser ein. In diesem Fall können die Schneidmesser ebenfalls im Zerspanungsprozess verloren gehen.
3. c) Die Wippenfreistellung mittels des Exzenterstücks (25 [2]) und den zugeordneten Komponenten an der Wippe ist aufwändig und kostentreibend.

According to the subject of the DE 10 2008 046 087 A1 [Reference number = 2], the rocker (22 [2]) is retracted for changing the knives using an eccentric piece (25 [2]). This has the following disadvantages:

1. a) If the eccentric piece is not properly reset after knife assembly, the rocker does not engage with the cutting knives and these can be lost in the machining process.
2. b) The rocker is moved axially backwards against the torsion spring (12 [2]). As a result of the frictional forces, primarily generated by contamination caused during the machining process, the spring designed primarily for torsion is no longer able to reliably reset the rocker and it no longer engages with the cutting blades. In this case, the cutting knives can also be lost in the machining process.
3. c) The rocker release using the eccentric piece (25 [2]) and the associated components on the rocker is complex and costly.

The invention is therefore based on the DE 10 2008 046 087 A1 The general task is to further develop a deburring tool so that its use is easier and more reliable. The operation of the tool and the setting of the deburring parameters should be easier, more reliable and more precise.

According to a first aspect of the invention, the invention therefore has the task of providing a reliable knife change in a deburring tool.

The solution to the task is carried out using the teaching of the independent

Patent claim 1. Advantageous further developments are the subject of the further independent subsidiary claims and/or the subclaims.

In a preferred embodiment, it is therefore provided that the knife change is carried out by axially displacing the knife housing relative to the rocker or to the base body. This is advantageously achieved by loosening the existing locking screws. In the prior art, the rocker was held in the base body in an axially displaceable manner to enable the cutting blades to be exchanged. According to the invention, however, the knife housing is axially displaceable and lockable on the axially immovable rocker, which leads to superior properties when changing knives.

Therefore - as is necessary in the prior art - there is no longer any need for an eccentric piece and the components assigned to the eccentric piece. Changing knives is particularly easy and reliable thanks to the axial displacement of the knife housing that accommodates the rocker.

According to a second aspect of the invention, there is a problem in the prior art in adjusting the chamfer size of the deburred bore edge by controlled rotational adjustment of the rocker.

1. a) Die Einstellschraube kann sich während dem Zerspanungsprozess durch Vibrationen verstellen und das Fasergebnis verändern beziehungsweise beeinträchtigen.
2. b) Die radiale Lage der Wippe kann nicht reproduzierbar eingestellt werden, weil eine Markierung, welche die Lage der Wippe anzeigt, fehlt.
3. c) Das Einstellen der radialen Wippenposition mittels dieser Einstellschraube und den entsprechenden Komponenten an der Wippe ist aufwändig und kostentreibend.

The DE 2649208 A1 [1] shows a rocker, referred to there as an intermediate body (14 [1]), which is positioned in its radial position to be adjustable in its rotational position by an adjusting screw (17 [1]) and the radial position of the cutting blades (24 [1]) and thus defining the chamfer size of the bore edge. This causes the following disadvantages:

1. a) The adjusting screw can be adjusted due to vibrations during the machining process and change or affect the chamfering result.
2. b) The radial position of the rocker cannot be adjusted reproducibly because a marking that shows the position of the rocker is missing.
3. c) Adjusting the radial rocker position using this adjusting screw and the corresponding components on the rocker is complex and costly.

According to this second aspect, the invention has the task of reproducibly adjusting and resetting the radial position of the knife housing to the rocker by twisting it by designing a new adjustment mechanism in order to adjust the barrel size and keep it process-reliable.

The DE 10 2008 046 087 A1 [2] showed that the knife housing (2 [2]) with the base body (1[2]) is always anchored radially in the same position and the chamfer size is adjusted by turning the rocker to the base body.

According to a preferred embodiment of the invention, however, it is provided that the rocker remains in the same stop position in the radial direction relative to the base body and the bevel size is achieved by rotating the knife housing relative to the rocker and the base body.

This means that a combination of the first aspect of the invention with the second aspect is preferred, although both aspects of the invention are also the subject of independent patent claims.

The combination of the two aspects is that the knife housing is mounted in an axially displaceable and lockable manner on the rocker and on the base body and adjusting piece that accommodates the rocker, and is also arranged on the rocker and the base body in a radially rotatable, adjustable and lockable manner. With this special displacement and rotational position adjustment of the knife housing relative to the rocker and the base body, the first two aspects of the invention can be implemented in combination. However, each aspect of the invention also has protection on its own.

1. a) Die Vorspannkraft auf die Wippe und damit der Verschiebungsdruck auf die Schneidmesser kann nur stufenweise (indexiert), also nicht stufenlos eingestellt werden.
2. b) Der Stand der Technik lässt keine Adaption eines Werkzeugschafts zu, um den Werkzeughalter mit einem anderen Durchmesser als dem des Grundkörpers (1[2]) in der Werkzugmaschine zu spannen. Dies weil die nach dem Stand der Technik gewählte Befestigung des Spannkopfs (5[2]) weder den notwendigen Rundlauf (Genauigkeit) noch die notwendige Starrheit für die Verwendung eines solchen Schaftes ermöglicht.

According to a third aspect of the invention, the DE 10 2008 046 087 A1 [2] that the radial preload of the rocker with the torsion spring for the restoring force of the cutting blades can be adjusted using the elements clamping head (5 [2]) and index bolt (6[2]). However, this results in the following disadvantages:

1. a) The preload force on the rocker and thus the displacement pressure on the cutting blades can only be adjusted gradually (indexed), i.e. not continuously.
2. b) The prior art does not allow for the adaptation of a tool shank in order to clamp the tool holder with a different diameter than that of the base body (1[2]) in the tool machine. This is because the fastening of the clamping head (5[2]) chosen according to the state of the art neither allows the necessary concentricity (accuracy) nor the necessary rigidity for the use of such a shaft.

According to a third aspect, the invention has therefore set itself the task of achieving both the use of a shaft and the stepless, reproducible and process-reliable pretensioning of the rocker by designing a new adaptation.

To solve the problem, it is proposed in an independent patent claim that the shaft is fixed in a force-fitting manner by means of two diametrically opposed locking screws which engage in an annular groove on the shaft side. By loosening these locking screws, the torsion spring can be continuously preloaded by rotating the shaft radially. By subsequently fixing the shaft, the set preload is reliably maintained. The reproducibility of the position is ensured by appropriate markings on the shaft and the base body.

All three aspects of the invention, in any combination with one another and/or alone, lead to a new concept of a deburring tool, which is described below with reference to the drawings.

The subject matter of the present invention arises not only from the subject matter of the individual patent claims, but also from the combination of the individual patent claims with one another.

All information and features disclosed in the documents, including the summary, in particular the spatial configuration shown in the drawings, could be claimed as essential to the invention if, individually or in combination, they are new compared to the prior art. The use of the terms “essential” or “according to the invention” or “essential to the invention” is subjective and does not imply that the features so named must necessarily be part of one or more patent claims.

• Fig. 1: Schnittdarstellung durch den Werkzeughalter mit einer Gesamtübersicht
• Fig. 2: Schnittdarstellung durch den Werkzeughalter mit Darstellung des Prinzips Messerwechsel (Wippe im Eingriff)
• Fig. 3: Schnittdarstellung durch den Werkzeughalter mit Darstellung des Prinzip Messerwechsel (Messer frei für Wechsel)
• Fig. 4: Schnittdarstellung durch den Werkzeughalter mit Darstellung des Prinzips der Justierung von Fas- und Entgratgrösse (Lösen und Festsetzen von Justierstück)
• Fig.5: Seitenansicht des Werkzeughalters mit Darstellung des Prinzips der Justierung von Fas- und Entgratgrösse (Beispielposition 1)
• Fig.6: Seitenansicht des Werkzeughalters mit Darstellung des Prinzips der Justierung von Fas- und Entgratgrösse (Beispielposition 2)
• Fig.7: Schnittdarstellung durch den Werkzeughalter mit Darstellung des Prinzips der Federvorspannung der Wippe
• Fig. 8: Perspektivische Darstellung eines Schneidmessers
• Fig. 9: Schnittdarstellung durch den Werkzeughalter mit Darstellung des Prinzips des Messerwechsels (Einführen der Messer)
• Fig. 10: Explosionsartige Darstellung der wesentlichen Teile des Entgratwerkzeugs
• Figur 11: Lösbare Verbindung zwischen dem Justierstück, dem Spannstück und dem Grundkörper
• Figur 12: Perspektivische Darstellung des Spannstücks
• Figur 13: Ansicht auf das Justierstück von der Verbindungsseite her
• Figur 14: Ansicht auf das Justierstück von der Innenseite her
• Figur 15: Perspektivische Darstellung der Montage von Spannstück und Justierstück
• Figur 16: Ansicht in das Innere des Justierstücks mit gekoppeltem Spannstück

The invention is explained in more detail below with reference to drawings showing only one embodiment. The drawings and their description reveal further features and advantages of the invention that are essential to the invention.

• Fig. 1 : Sectional view through the tool holder with an overall overview
• Fig. 2 : Sectional view through the tool holder showing the knife changing principle (rocker in engagement)
• Fig. 3 : Sectional view through the tool holder showing the principle of knife change (knife free for change)
• Fig. 4 : Sectional view through the tool holder showing the principle of adjusting the chamfer and deburring size (loosening and fixing the adjusting piece)
• Fig.5 : Side view of the tool holder showing the principle of adjusting the chamfer and deburring size (example position 1)
• Fig.6 : Side view of the tool holder showing the principle of adjusting the chamfer and deburring size (example position 2)
• Fig.7 : Sectional view through the tool holder showing the principle of the spring preload of the rocker
• Fig. 8 : Perspective view of a cutting knife
• Fig. 9 : Sectional view through the tool holder showing the principle of changing knives (inserting the knives)
• Fig. 10 : Exploded view of the essential parts of the deburring tool
• Figure 11 : Detachable connection between the adjusting piece, the clamping piece and the base body
• Figure 12 : Perspective view of the clamping piece
• Figure 13 : View of the adjusting piece from the connection side
• Figure 14 : View of the adjusting piece from the inside
• Figure 15 : Perspective view of the assembly of the clamping piece and adjusting piece
• Figure 16 : View of the interior of the adjusting piece with the coupled clamping piece

Basic function of tool holder 1

The tool holder 1, which is driven to rotate in the direction of rotation 36, is used to apply chamfers or deburring to the front and/or rear edges of the bore. The tool axis 37 is aligned with the center axis of the hole to be deburred.

The tool holder 1 works with two cutting blades 2, 2a that act diametrically opposite each other. Such a cutting knife 2, 2a and its drive are, for example, in the EP 0 291 563 B1 described. Reference is made to the disclosure there. Since the cutting knives 2, 2a are designed identically, it is sufficient for the following description to describe only one cutting knife 2.

The cutting knives 2, 2a are according to Figures 2 and 3 held in its extended position by a cylindrical rocker 4 which is spring-loaded and rotates in the tool axis 37 by means of rocker bolts 15, 15a directed in the axial direction and which engage in bolt grooves 25 in the top sides of the cutting blades 2, 2a. This position also defines the radial position of the cutting edges 27, 28 of the cutting blades 2, 2a according to Figure 8 and thus the size of the deburring or the chamfer.

The rocker 4 is according to Figure 4 held in a basic position in a spring-loaded manner relative to the base body 6 by its stop bolt 10 pointing in the radial direction, which rests on a stop bolt 11 of the base body 6.

In the opposite direction, the rocker 4 can rotate freely against the spring preload of a torsion spring 9. The torsion spring is supported according to Figure 1 with its upper end on an axial extension of the shaft 7, while the lower end is connected to an axial extension of the rocker 4.

During the machining process, when the chamfering or deburring size is reached, the cutting knives 2 can retract as a result of the process forces and slide through the hole to be deburred in order to exit the hole on the opposite side and come into their extended position under spring loading.

The rocker 4 is rotated against the spring force of the torsion spring 9 and further prestressed. This pretension then drives the cutting blades 2 radially outwards again for the next process step of further deburring. With an axial backward movement of the rotating tool holder 1, the rear edge of the hole can also be deburred or chamfered.

1. 1. Für die Bearbeitung von Werkstücken mit diesem Werkzeug ist es notwendig, dass von Zeit zu Zeit die Schneidmesser 2 ausgewechselt werden können,
2. 2. dass die Fas- beziehungsweise die Entgratgrösse justiert werden kann und
3. 3. dass die Vorspannkraft der Wippe 4 verändert werden können.

The invention thus describes a novel concept of a deburring tool which, alone or in any combination, has the following features:

1. 1. For processing workpieces with this tool, it is necessary that the cutting blades 2 can be replaced from time to time,
2. 2. that the bevel or deburring size can be adjusted and
3. 3. that the preload force of the rocker 4 can be changed.

These features are presented below:

1. Changing the cutting blades 2 (Figures 2, 3, 8 and 9)

The cylindrical pin-shaped rocker 4 is rotatably mounted in a knife housing 3, at the lower end of which a window-like knife recess 20 is arranged for storing the cutting knives 2, 2a arranged there.

In the knife housing 3 are according to Figures 1 - 3 Diametrically opposite threaded holes are arranged, in each of which a locking screw 12, 12a is screwed. In the clamping position, each locking screw 12, 12a is supported with its bolt-side end on the outer circumference of the rocker 4.

By loosening the locking screws 12, 12a for fixing the knife housing 3, the knife housing 3 can be pulled forward relative to the rocker 4 in the axial direction of the arrow 18. This is in comparison between the Figures 2 and 3 visible. The rocker 4 thus forms the bearing body for the Displacement of the knife housing 3, which is slidably mounted on the rocker 4. The cutting knives 2, 2a, which are mounted in the knife recess 20 in the base body 6, also move forward with the axial displacement of the knife housing 3. The two rocker bolts 15, 15a lose their engagement in the bolt grooves 25 of the cutting knives 2, 2a and the knives come free and can be removed from the knife recess 20.

This process is in comparison between Figure 2 and Figure 3 recognizable. The knife housing 3 is displaceable with an inner, central axial extension and can be fixed in the direction of rotation in a central bearing holder 50 in an adjusting piece 5. The axial feed movement of the knife housing 3 in the central bearing holder 50 in the direction of the arrow 18 on the rocker 4 held in the tool holder 1 results in accordance with Figure 3 a free space 39 between the inner end face of the knife housing 3 and the opposite end face of the base body 6 and due to this axial distance, the rocker bolts 15, 15a come out of engagement with the knife-side bolt grooves 25. The cutting knives 2, 2a can then be removed from the knife recess 20 and counteracted new cutting blades need to be replaced.

So that the knife housing 2 cannot be completely pulled out of the bearing holder 50 during this action and does not lose its orientation for re-fixing by means of the locking screws 12, 12a, a limiting screw 16 is provided in the adjusting piece 5, which is inserted into a limiting groove 17 in the knife housing 3 intervenes and restricts the movement of the knife housing 2 both radially and axially.

The adjusting piece 5 is according to Figures 10-16 a cylindrical sleeve which has the lower bearing holder 50, which is open on one side in the axial direction, into which a central axial extension of reduced diameter of the knife housing 3 engages and is accommodated there in a displaceable and fixable manner. The adjusting piece 5 is according to Figures 2 and 3 connected via bearing bolts to the lower end face of a clamping piece 8.

Before inserting new cutting knives 2, 2a, the knife housing 3 is first pushed back in the direction of arrow 19 and fixed again in a form-fitting manner with the adjusting piece 5 by means of the locking screws 12, 12a. The new cutting knives 2, 2a can then be inserted independently of one another, one after the other in the direction of sight 30, into the knife recess 20 in the knife housing 6. The insertion bevels 26 of the cutting blades 2, 2a provided for this purpose press the rocker 4 in the axial direction of the arrow 31 (see Fig. 9 ) to the rear and the rocker bolts 15, 15a of the rocker 4, which is now also axially spring-loaded, snap back into the bolt grooves 25 (see Fig. 8 ) and also fix the cutting blades 2, 2a in the radial direction.

2. Chamfer diameter adjustment mechanism (Figures 4, 5 and 6)

In the basic position of the tool holder 1, before the planned chamfer or deburring is applied, the rocker 4 is in a spring-loaded fixed position relative to the base body 6. The components stop bolts 10 of the rocker 4 and stop bolts 11 in the base body 6 hold the rotating spring-loaded rocker 4 in one Direction in this fixed position in that the torsional force of the torsion spring 9 presses the rocker-side stop bolt 10 against the base body-side stop bolt 11.

In order to set or adjust the bevel or deburring size, it is necessary to move the knife housing 3 in the circumferential direction relative to the rocker 4 and thus to the base body 6. The necessary components to carry out this adjustment process continuously and with sufficient precision are the adjusting piece 5, the clamping piece 8 and the locking screws 13, 13a. They connect the knife housing 3 to the base body 6 both releasably and in a fixed state with sufficient accuracy to ensure the concentricity of the knife housing 3 and provide sufficient adhesion to transmit the cutting forces to the shaft 7.

During tool assembly, a connection is established between the adjusting piece 5 and the clamping piece 8, which is maintained throughout the entire service life of the tool. This is advantageously done using the measures described below.

The recess 48 on the top of the adjusting piece 5 is designed in such a way that during tool assembly, the cam 47 on the clamping piece 8 can be inserted in a certain rotational position through the recess 48 into the adjusting piece 5 and engages on the inside of the adjusting piece 5 by subsequent rotation. The recess 48 corresponds approximately to the shape of the cam 47 and only serves to insert the cam 47 into the adjusting piece 5. The recess 48 no longer has any function during operation.

The elongated shape of the cam 47 and correspondingly that of the recess 48 in the adjusting piece 5 have the aim during assembly that the cam 47, with approximately 90° rotation, finds a counter surface, namely the contact surface 43, on the inside of the adjusting piece 5 and the adjusting piece 5 on can use the base body 6. It is therefore a rotary plug connection between the clamping piece 8 connected to the cam 47 and the adjusting piece 5 which is detachably connected to it - for the purpose of assembly - and which is thereby connected to the base body 6.

In another preferred embodiment, such a detachable connection can also be designed in the form of a kinematic reversal of the rotary plug connection described above. The cam 47 is formed on the adjusting piece 5 in an axial extension and engages in a shape-adapted recess 48 in the clamping piece 8 in the manner of the rotary plug-in coupling described above.

In addition to this kinematic reversal of a releasable plug-turn coupling connection, there are other preferred embodiments for connecting the three parts 5, 6, 8 mentioned. For example, a magnetic coupling can be provided for the releasable coupling of these parts. Likewise, several cams distributed around the circumference can be arranged on the front side of one part be, which engage in similar recesses on the opposite part, which are distributed around the circumference.

Neither the adjusting piece 5 nor the clamping piece 8 with its cam 47 have a fixed connection to the rocker 4. The rocker 4 engages freely through these components 5, 8 and can be freely moved both axially and radially relative to these components 5, 8 .

Accordingly, according to the Figure 11 the adjusting piece 5 is detachably connected to the base body 6 via the clamping piece 8. On the clamping piece 8 is according to Figure 12 The oval or rectangular cams 47 are formed in the axial extension. The Figure 13 shows the view of the adjusting piece 5 seen from the connection side to the base body 5. The Figure 14 shows the view of the interior of the adjusting piece 5 with the contact surface 43.

You Figure 15 shows the view of the adjusting piece 5 and the clamping piece 8 in the orientation of how the cam 47 of the clamping piece 8 can be inserted into the adjusting piece 5 when assembling the tool. Furthermore, it shows Figure 16 the view into the interior of the adjusting piece 5 with the now transverse cam 47 of the clamping piece 8, which has the task of pulling the adjusting piece 5 releasably and also rotatably in the released state onto the base body 6.

It is provided that the adjusting piece 5 rests rotatably on the base body 6 by means of this cam 47 in the released state for the setting or adjustment of the barrel size and that in the fixed state the cam 47 pulls the adjusting piece 5 axially towards the base body 6, so that with the Due to the resulting frictional forces at this connection, the adjusting piece 5 is also fixed radially (in the direction of rotation) with the base body 6.

On the one hand, the clamping piece 8 enables the barrel size to be adjusted continuously and guarantees that the setting made does not change when the adjusting piece 5 is fixed. The cylindrical pin-like rocker 4 takes effect according to this

Figure 10 through the center bore 49 of the clamping piece 8.

The cylindrical adjusting piece 5 accommodates the clamping piece 8 with its central recess 48.

By loosening the locking screws 13, 13a, the frictional connection between the base body 6 and the adjusting piece 5 is canceled and the cutting blades 2, 2a can be adjusted according to Figure 7 can be radially displaced and adjusted by rotating the knife housing 3, for example in the direction 21, relative to the rocker 4 via the eccentric gear formed by the rocker bolts 15, 15a and the knife-side bolt grooves 25. Those in the upper part of the Figures 5 and 6 Markings 22 shown on the base body 6 and the adjusting piece 5 help to adjust the rotational position of the knife housing 3 in a scaled and reproducible manner. The maximum adjustment range is limited by the engagement of the limiting pin 23 in the adjusting piece 5 in the limiting groove 24 in the base body 6, so that the cutting blades 2, 2a cannot be moved beyond the geometrically defined area in the radial direction.

When tightening the base body-side locking screws 13, 13a, which engage with their bolt ends in radially outwardly directed conical surfaces 45 in the clamping piece 8, the frictional connection between the adjusting piece 5 and the base body 6 is restored by means of the clamping piece 8 and the two components 5, 6 are fixed to one another without that the set adjustment is moved.

3. Adjusting the spring preload of the torsion spring 9 (Figure 7)

The novel tool concept provides for the use of a shaft 7 for adapting the tool holder 1 in the machine tool. The shaft 7 is connected to a motor-driven, rotationally driven chuck in the machine tool, not shown in the drawings.

The adjustment of the radially acting spring preload of the rocker 4, namely the preload moment on the cutting blades 2, 2a, which is necessary for processing various materials, is advantageously integrated into the connection of the base body 6 and shaft 7. The cutting force is transmitted via the rotational load-transmitting connection between the base body 6 and shaft 7 transferred to the locking screws 14, 14a in the base body 6. The locking screws 14, 14a in the base body 6 engage in an annular groove 38 in the shaft 7. According to Figure 7 is the torsion spring 9 is connected at its upper end to an axial extension on the underside of the shaft 7, while the other end is connected to an axial extension of the rocker 4.

When loosening the two locking screws 14, 14a, the shaft 7 can be rotated relative to the base body 6 in the direction of the arrow 35, for example, and in this case the torsion spring 9 can be tensioned and relaxed in the opposite direction. By subsequently tightening the locking screws 14, 14a, the force-transmitting connection between the shaft 7 and the base body 6 is restored. The diametrically opposed locking screws 14, 14a also enable the necessary precision of the connection to ensure the concentricity of the tool holder 1 as a whole. The markings 34 on the base body 6 and the shaft 7 enable a scalable and reproducible adjustment of the preload force of the torsion spring 9. The maximum desired adjustment range is limited in the circumferential direction by the elements limiting pin 32 in the shaft 7 and limiting groove 33 in the base body 6.

From the explosive representation of the Figure 10 further details of the deburring tool according to the invention emerge.

In the fixed state, the parts knife housing 3, adjusting piece 5 and base body 6 are firmly connected to one another in the knife housing 3 via the locking screws 12, 12a. The connection of the adjusting piece 5 to the base body 6 is made adjustable and lockable in the axial arrow direction 46 by means of the clamping piece 8. The clamping piece 8 is detachably connected to the base body 6 by means of the locking screws 13, 13a. The bolt-side conical surfaces 44 of the locking screws 13, 13a engage in the approximately similar bore-side conical surfaces 45 in the clamping piece 8.

The clamping piece 8 engages with its cam 47 arranged on the underside into the interior of the adjusting piece 5 in a shape-adapted manner arranged there Recess 48 so that the cam contact surface 42 on the clamping piece side rests on the inner contact surface 43 of the adjusting piece 5.

By fixing the two base body-side locking screws 13, 13a in the radially outwardly directed conical surfaces 45 designed as bores in the clamping piece 8, the clamping piece 8 is moved axially in the direction of arrow 46 into the base body 6 and attracts the adjusting piece 5 to the base body 6 in the axial direction . The upper, frontal contact surface 40 of the adjusting piece 5 lies against the opposite contact surface 41 of the base body 6 and builds up the necessary radially acting adhesion. The adjusting piece 5 is thus fixed axially by positive connection and radially by non-positive connection with the base body 6. The rocker 4 remains mounted so that it can rotate and move axially relative to the parts of the knife housing 3, the adjusting piece 5 and the clamping piece 8. By slightly loosening the locking screws 13, 13a, the radially acting frictional connection between the base body 6 and the adjusting piece 5 is canceled and the adjusting piece 5, together with the knife housing 3 attached to it, can be rotated relative to the base body 6. This allows the bevel or deburring size to be set or adjusted. This connection between the adjusting piece 5 and the base body 6 is therefore produced by means of the clamping piece 8, so that when these two parts are fixed, no disruptive forces occur during rotation, which again impair the precise adjustment when fixed. The clamping piece 8 only serves as a connecting piece to guarantee an exclusively axially directed movement.

The axial movement in the direction of arrow 46 for fixing the parts of the adjusting piece 5 by means of the clamping piece 8 and base body 6 is triggered by the engagement of the outer conical surfaces 44 of the locking screws 13, 13a in the inner conical surfaces 45 of the clamping piece 8.

Reference symbol list

1

Tool holder

2

cutting knife

2a

cutting knife

3

Knife housing

4

Seesaw

5

Adjustment piece

6

Basic body

7

shaft

8th

clamping piece

9

Torsion spring

10

Stop bolt (rocker)

11

Stop bolt (base body)

12

Locking screw (blade housing)

12a

Locking screw (blade housing)

13

Locking screw (adjustment piece)

13a

Locking screw (adjustment piece)

14

Locking screw (shaft)

14a

Locking screw (shaft)

15

rocker bolt

15a

rocker bolt

16

Limit screw

17

Limiting groove (blade housing)

18

Bearing direction

19

Arrow direction

20

Knife recess

21

Arrow direction (adjustment piece)

22

Marking (barrel size)

23

Limit pin (adjustment piece)

24

Limiting groove (base body)

25

Bolt groove (knife)

26

Introduction slant

27

Cutting edge (forward)

28

Cutting edge (reverse)

29

chip trough

30

Arrow direction (knife)

31

Arrow direction (rocker)

32

Limit pin (shaft)

33

Limiting groove (base body)

34

Marking (spring preload)

35

Arrow direction (shaft)

36

Direction of rotation

37

Tool axis

38

Annular groove (shaft)

39

free space

40

Rear contact surface (adjustment piece)

41

Contact surface (base body)

42

Cam contact surface (clamping piece)

43

Internal contact surface (adjustment piece)

44

Conical surfaces on the outside (of 13, 13a)

45

Conical surfaces on the inside (clamping piece)

46

Arrow direction

47

cam (clamping piece)

48

recess

49

Center hole (in 8)

50

Storage recording (in 5 for 3)

Claims (28)

Deburring tool for deburring bores with a pairwise arrangement of cutting knives (2, 2a) and a rotatably driven tool holder (1), the cutting knives (2, 2a) being opposite each other in a knife recess (20) of a knife housing (3) with radially outward-pointing, conical cutting edges (27, 28) are driven radially displaceable relative to one another by a rotatable rocker (4) arranged in a base body (6) of the tool holder (1), and the rocker (4) is rotatably mounted in the tool holder (1) about an axial longitudinal axis and is resiliently preloaded in the axial direction, characterized in that for changing the blades of the cutting blades (2, 2a), the blade housing (3) is mounted on the rocker (4) and the base body (6) in an axially displaceable and fixable manner. Deburring tool according to claim 1, characterized in that the rocker (4) engages with rocker bolts (15, 15a) directed in the axial direction in the knife-side bolt grooves (25) in the upper sides of the cutting knives (2, 2a), and that for changing the knives the rocker bolts ( 15, 15a) can be brought out of engagement with the knife-side bolt grooves (25) by the axial displacement of the knife housing (3) on the rocker (4). Deburring tool according to claim 1 or 2, characterized in that in order to determine the relative displacement position between the knife housing (3) and the rocker (4), one or more locking screws (12, 12a) are arranged in an adjusting piece (5), which have their bolt-side ends can be placed on the knife housing (3). Deburring tool according to claim 3, characterized in that to limit the axial displacement of the knife housing (3), a limiting screw (16) is provided which is arranged in the adjusting piece (5) in the radial direction and which has its bolt-side end in a limiting groove (17) directed in the axial direction ) engages in the knife housing (3). Deburring tool according to one of claims 1 to 4, characterized in that for the interchangeable connection of the cutting blades (2, 2a) to the rocker (4), the axial rocker bolts (15, 15a) are arranged at the lower end of the rocker (4), which with Insertion bevels (26) leading into the bolt grooves (25) interact in a spring-loaded manner on the cutting blades (2, 2a). Deburring tool according to claim 5, characterized in that each cutting knife (2, 2a) can be individually inserted into the knife recess (20) in the knife housing (6) and that the insertion bevels (26) of the cutting knives (2, 2a) form the rocker (4). press spring-loaded in the axial direction of the arrow (31) against a torsion spring (9) and the rocker bolts (15, 15a) of the spring-loaded rocker (4) engage in the knife-side bolt grooves (25) and the cutting knives (2, 2a) in the radial direction in the knife recess (20) in the knife housing (3). Deburring tool for deburring bores with a pairwise arrangement of cutting knives (2, 2a) and a rotatably driven tool holder (1), the cutting knives (2, 2a) being opposite each other in a knife recess (20) of a knife housing (3) with radially outward-pointing, conical cutting edges (27, 28) are driven radially displaceable relative to one another by a rotatable rocker (4) arranged in a base body (6) of the tool holder (1), and the rocker (4) is rotatably mounted in the tool holder (1) about an axial longitudinal axis and is resiliently preloaded in the axial direction, characterized in that to adjust the chamfer size of a bore edge, the radial rotational position of the knife housing (3) can be continuously rotated and fixed relative to the rocker (4) and the base body (6). Deburring tool according to one of claims 1 to 7, characterized in that a stop bolt (10) of the rocker (4) and a stop bolt (11) in the base body (6) rotate the spring-loaded rocker (4) in a direction of rotation in a fixed stop position in the knife housing (3) hold. Deburring tool according to claim 8, characterized in that the torsional force of the torsion spring (9) biases the rocker-side stop bolt (10) against the base body-side stop bolt (11) in the one-sided stop position of the rocker (4). Deburring tool according to one of claims 1 to 9, characterized in that the cylindrical adjusting piece (5) connected to the base body (6) is releasably coupled at the end to a cylindrical clamping piece (8). Deburring tool according to one of claims 1 to 10, characterized in that radially inwardly directed locking screws (13, 13a) are arranged in the base body (6), which connect the adjusting piece (5) to the base body (6) by means of the clamping piece (8). as well as in the fixed state in order to transmit the cutting forces to the shaft (7). Deburring tool according to one of claims 7 to 11, characterized in that the stepless adjustment of the chamfer size of the bore edge is carried out by rotating the adjusting piece (5) relative to the base body (3) and that when fixing the adjusting piece (5) with the help of the internal clamping piece (8 ) the barrel size setting is fixed. Deburring tool according to one of claims 7 to 12, characterized in that by loosening the locking screws (13, 13a) on the base body, the frictional connection between the base body (6) and the adjusting piece (5) is canceled and that the cutting blades (2, 2a) are removed by twisting of the knife housing (3) can be radially displaced and adjusted relative to the rocker (4) via the eccentric gear formed by the rocker bolts (15, 15a) and the knife-side bolt grooves (25). Deburring tool according to one of claims 7 to 13, characterized in that for adjusting the rotational position of the knife housing (3) in a scaled and reproducible manner, markings (22) are present on the base body (6) in comparison to markings on the adjusting piece (5). Deburring tool according to claim 14, characterized in that to limit the maximum adjustment range of the cutting blades (2, 2a), a limiting pin (23) in the adjusting piece (5) engages in a limiting groove (24) in the base body (6). Deburring tool according to one of claims 7 to 15, characterized in that when the locking screws (13, 13a) on the base body side are tightened against the clamping piece (8), the frictional connection between the adjusting piece (5) and the base body (6) can be restored. Deburring tool for deburring bores with a pairwise arrangement of cutting knives (2, 2a) and a rotatably driven tool holder (1), the cutting knives (2, 2a) being opposite each other in a knife recess (20) of a knife housing (3) with radially outward-pointing, conical cutting edges (27, 28) are driven radially displaceable relative to one another by a rotatable rocker (4) arranged in a base body (6) of the tool holder (1), and the rocker (4) is rotatably mounted in the tool holder (1) about an axial longitudinal axis and is resiliently preloaded in the axial direction by means of a torsion spring (9), characterized in that for a stepless, reproducible and process-reliable preloading of the rocker (4), the torsion spring (9) can be preloaded continuously by radially rotating the shaft (7). Deburring tool according to claim 17, characterized in that the preload moment of the rocker (4) necessary for processing different materials is integrated into the connection of the base body (6) and shaft (7) by adjusting the radially acting spring preload of the rocker (4). Deburring tool according to claim 17 or 18, characterized in that the shaft (7) can be fixed in a rotational position on the base body (6) by means of locking screws (14, 14a) on the base body side. Deburring tool according to one of claims 17 to 19, characterized in that markings (34) on the base body (6) and the shaft (7) provide a scalable and reproducible adjustment of the preload force of the torsion spring (9). Deburring tool according to one of claims 17 to 20, characterized in that the maximum adjustment range when rotating the shaft (7) is given by a limiting pin (32) in the shaft (7), which is inserted into a limiting groove (33) in the base body (6). intervenes. Deburring tool according to at least one of claims 1 to 21, characterized in that in the fixed state the knife housing (3), the adjusting piece (5) and the base body (6) are firmly connected to one another and that the connection of the adjusting piece (5) to the base body (6) is produced by means of the clamping piece (8) in the axial direction of the arrow (46). Deburring tool according to at least one of claims 1 to 22, characterized in that the clamping piece (8) is releasably connected to the base body (6) by means of the locking screws (13, 13a). Deburring tool according to claim 23, characterized in that the clamping piece (8) is releasably coupled to the adjusting piece (5). Deburring tool according to claim 23 or 24, characterized in that the releasable coupling between the clamping piece (8) and the adjusting piece (5) is designed as a plug-in rotary coupling. Deburring tool according to one of claims 17 to 25, characterized in that the chamfer or deburring size is thereby is adjustable or adjustable so that when the two conical locking screws (13, 13a) arranged in the base body (6) are fixed in associated, radially directed conical surfaces (45) arranged in the clamping piece (8), the clamping piece (8) moves in the axial direction of the arrow (46 ) can be moved into the base body (6) and thereby attracts the adjusting piece (5) to the base body (6) in the axial direction. Deburring tool according to at least one of claims 1 to 26, characterized in that the adjusting piece (5) is connected axially by positive locking and radially by non-positively to the base body (6) and that the rocker (4) is connected to the knife housing (3), the adjusting piece (5) and the clamping piece (8) remains rotatably and axially displaceable. Deburring tool according to at least one of claims 1 to 27, characterized in that the positive connection between the adjusting piece (5) and the base body (6) is produced by means of the clamping piece (8), so that when these two parts (5, 6) are fixed there is no movement in the direction of rotation disruptive forces occur which affect the precise adjustment when setting

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